Flush-mount swivel tweeter system for vehicular audio

A swivel tweeter assembly that flush-mounts to a panel of a host vehicle through a circular opening in the panel, comprising:

• a hemispherically-shaped shell housing having a forward-facing main circular opening perpendicular to a central axis of the shell housing;
• a tweeter unit, constituting a high frequency electro-acoustic transducer, mounted co-axially within said shell housing in a forward-facing position, thus forming a tweeter-shell assembly;
• an acoustically-transparent protective grill in said tweeter unit, affixed in a frontal location thereof;
• a mounting bushing configured to have externally as a cylindrical sleeve having an annular flange extending radially at a forward end thereof and configured internally with rear bulkhead articulated to define a cavity region facing the forward end with a bearing surface shaped as a portion of sphere arranged to interface with said hemispheric shell housing in a ball-joint manner that enables the tweeter-shell assembly to swivel off-axis relative to said mounting bushing;
• fastening means, for securing said shell housing to said mounting bushing at a selected disposition within the swivel range, comprising (1) a threaded shaft of a machine bolt having a head integrally molded in said shell housing in a coaxial relation thereto such that said shaft extends rearwardly from said shell housing through a slot provided in the bulkhead of said mounting bushing in a central region of the bearing surface and (2) a machine nut engaging said threaded shaft and tightened against a rear bearing surface of the bulkhead of said mounting bushing flanking the slot, so as to secure said shell housing to said mounting bushing;
• and
• a mounting nut threaded onto the externally-threaded sleeve of said mounting bushing and tightened against a rear surface of the panel so as to thus hold the mounting bushing in place in the panel in a working disposition.